TY  - JOUR
TT  - Different Duty Cycle Ratio and Brightness Of Visual Stimuli Change To Steady State Visual Evoked Potential Response
AU  - Oralhan, Zeki
AU  - Tokmakçı, Mahmut
PY  - 2016
DA  - December
DO  - 10.18100/ijamec.266073
JF  - International Journal of Applied Mathematics Electronics and Computers
PB  - PLUSBASE AKADEMİ ORGANİZASYON VE DANIŞMANLIK
WT  - DergiPark
SN  - 2147-8228
SP  - 82
EP  - 85
IS  - Special Issue-1
KW  - Brain Computer Interface
KW  - EEG
KW  - Human-Computer Interaction and Systems
KW  - Steady State Visual Evoked Potential
N2  - Stimuli types arevery crucial for the performance of electroencephalogram (EEG) based braincomputer interface (BCI) systems. This study aims to investigate methods forobtaining higher information transfer rate (ITR) through duty cycle andbrightness variation of visual stimuli which have high frequency for steadystate visual evoked potential-based BCI. Although previous studies wereconcentrated on either duty cycle or brightness of stimuli separately, ourstudy focused on the change of duty cycle ratio and brightness of stimuli atthe same time. Duty cycle values of 40%, 50%, and 60% were used. During theexperiment, 16 flickering stimuli were used on liquid crystal display. Participantsgazed to the flicker which had frequency of 15 Hz. Canonical correlationanalyses (CCA) was used for channel selection and frequency detection.According to the CCA, the maximum average accuracy of the experiment was 92.54%when the frequency of flicker was in beta band and its duty cycle was 40% witha brightness tuning wave. Under the same conditions stated above, average ITRwas improved 16.1% according to the most commonly used flicker model which issquare wave and has 50% duty cycle.
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UR  - https://doi.org/10.18100/ijamec.266073
L1  - https://dergipark.org.tr/en/download/article-file/232560
ER  -